jQuery(function($){
   
   $(".exist-over-image").mouseover(function(e){
       var basic_src = $(this).attr("src");
       var basic_src_subindex = basic_src.lastIndexOf(".");
       var basic_src_temp1 = basic_src.substr(0,basic_src_subindex)+"_ov";
       var basic_src_temp2 = basic_src.substr(basic_src_subindex);
       
       var over_src = basic_src_temp1+basic_src_temp2;
       $(this).attr("src",over_src);
   });
   
   $(".exist-over-image").mouseout(function(e){
       var over_src = $(this).attr("src");
       var basic_src = over_src.replace("_ov","");
       $(this).attr("src",basic_src);
   });
});

